They should work by default when Mirror is in Development mode (and phone has internet access) or Display Access Control is off. Since it is not assigned to your account you cannot even check if somebody else has changed those settings.
It is also hard to tell why custom template is not detecting beacons, since you didn’t provide any template code here. Simple typo in JavaScript code may prevent it from working.
You may try to switch to estimote/scanner template to check if BLE scanning works.
You can find some more information about this on this thread: Estimote Mirror Documentation
This may also be helpful with debugging:
https://developer.estimote.com/mirror/javascript-api-for-templates/#displaying-debug-messages-on-the-screen
So what about that WiFi? Did you manage to configure it?